An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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comparison spectrum
  بیناب ِ هم‌سنجش  
binâb-e hamsanješ
Fr.: spectre de comparaison  

A spectrum of known substances used as a standard of comparison for investigating spectra of celestial objects.

See also: → comparison; → spectrum.